Emission estimation calculators, booklet 1: chapter 9


Grain Elevator

The substances of concern released from the operation of grain elevators Criteria Air Contaminants (Part 4 Substances).

Download spreadsheet calculator: Grain Elevators [xls 114 kb] (4 Feb 2009)

Suggested estimation methodology: Emission Factor

The general equation for emissions estimation is:

E = A x EF

where:

  • E = emissions
  • A = activity rate
  • EF = emission factor

Input Data

The activity rate (A) is the number of tonnes of grain processed. There are individual emission factors for Total Particulate Matter (TPM), Particulate matter with a diameter less than or equal to 10 micrometres (µm) (PM10) and Particulate matter with a diameter less than or equal to 2.5 micrometres (PM2.5) for each of the grain elevator processes. The total emissions for each substance will be the sum of the each of the emissions for each process.

Releases for Part 4 Substances

Total Particulate Matter (TPM) Footnote*
Process Emission Factor (EF)Footnote1 EF Units
Grain Drying - Column Dryer 0.11 kilograms (kg)/tonne
Grain Drying - Rack Dryer 1.5 kg/tonne
Grain Drying - Rack Dryer (Self-cleaning screens (< 50 mesh)) 0.235 kg/tonne
Headhouse & Internal Handling (legs, belts, distributors, scale, etc.) 0.0305 kg/tonne
Grain Cleaning - Internal Vibrating (Single Cyclone only)Footnote** 0.0375 kg/tonne
Unloading (Receiving) from Straight Trucks 0.09 kg/tonne
Unloading (Receiving) from Hopper Trucks 0.0175 kg/tonne
Unloading (Receiving) from Railcars 0.016 kg/tonne
Unloading (Receiving) from Ships 0.075 kg/tonne
Unloading (Receiving) from Barges - Continuous Barge Unloader 0.0145 kg/tonne
Unloading (Receiving) from Barges - Marine Leg 0.075 kg/tonne
Loading (Shipping) into Ships 0.024 kg/tonne
Loading (Shipping) into Barges 0.008 kg/tonne
Loading (Shipping) into Trucks (unspecified type) 0.043 kg/tonne
Loading (Shipping) into Railcars 0.0135 kg/tonne
Storage Bin Vents 0.0125 kg/tonne
Particulate Matter less than or equal to 10 µm (PM 10) Footnote*
Process Emission Factor (EF)Footnote1 EF Units
Grain Drying - Column Dryer 0.0275 kg/tonne
Grain Drying - Rack Dryer 0.375 kg/tonne
Grain Drying - Rack Dryer (Self-cleaning screens (< 50 mesh)) 0.06 kg/tonne
Headhouse & Internal Handling (legs, belts, distributors, scale, etc.) 0.017 kg/tonne
Grain Cleaning - Internal Vibrating (Single Cyclone only)Footnote** 0.0095 kg/tonne
Unloading (Receiving) from Straight Trucks 0.0295 kg/tonne
Unloading (Receiving) from Hopper Trucks 0.0039 kg/tonne
Unloading (Receiving) from Railcars 0.0039 kg/tonne
Unloading (Receiving) from Ships 0.019 kg/tonne
Unloading (Receiving) from Barges - Continuous Barge Unloader 0.00365 kg/tonne
Unloading (Receiving) from Barges - Marine Leg 0.019 kg/tonne
Loading (Shipping) into Ships 0.006 kg/tonne
Loading (Shipping) into Barges 0.002 kg/tonne
Loading (Shipping) into Trucks (unspecified type) 0.0145 kg/tonne
Loading (Shipping) into Railcars 0.0011 kg/tonne
Storage Bin Vents 0.00315 kg/tonne
Particulate Matter less than or equal to 2.5 µm (PM 2.5) Footnote*
Process Emission Factor (EF)Footnote1 EF Units
Grain Drying - Column Dryer 0.0047 kg/tonne
Grain Drying - Rack Dryer 0.065 kg/tonne
Grain Drying - Rack Dryer (Self-cleaning screens (< 50 mesh)) 0.01 kg/tonne
Headhouse & Internal Handling (legs, belts, distributors, scale, etc.) 0.0029 kg/tonne
Grain Cleaning - Internal Vibrating (Single Cyclone only)Footnote** 0.0016 kg/tonne
Unloading (Receiving) from Straight Trucks 0.005 kg/tonne
Unloading (Receiving) from Hopper Trucks 0.00065 kg/tonne
Unloading (Receiving) from Railcars 0.00065 kg/tonne
Unloading (Receiving) from Ships 0.0025 kg/tonne
Unloading (Receiving) from Barges - Continuous Barge Unloader 0.00095 kg/tonne
Unloading (Receiving) from Barges - Marine Leg 0.0025 kg/tonne
Loading (Shipping) into Ships 0.0011 kg/tonne
Loading (Shipping) into Barges 0.000275 kg/tonne
Loading (Shipping) into Trucks (unspecified type) 0.00245 kg/tonne
Loading (Shipping) into Railcars 0.000185 kg/tonne
Storage Bin Vents 0.00055 kg/tonne

Note on Emissions Factors

The default emission factors are used in the table above, however if you have a site specific emission factor you would prefer to use you may enter it in the emission factor column. If you choose to insert your own emission factor ensure that the units have been converted accordingly. 

Except where indicated, the emission factors used in this spreadsheet are based on uncontrolled emissions. If you are using an emission control device you will have to adjust the emissions calculated by this spreadsheet according to the following formula:

Controlled Emissions = Uncontrolled emission x ((100 - control efficiency)/100)

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